/** Copyright 2020 Tianshu AI Platform. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * =============================================================
 */

import { reactive } from '@vue/composition-api';

function useDraw() {
  const state = reactive({
    start: undefined,
    end: undefined,
    isDrawing: false,
  });

  function onDrawStart({ x, y }) {
    Object.assign(state, {
      start: { x, y },
      isDrawing: true,
      end: undefined,
    });
  }

  function onDrawMove({ x, y }) {
    Object.assign(state, {
      end: { x, y },
    });
  }

  function onDrawEnd() {
    Object.assign(state, {
      isDrawing: false,
    });
  }

  function onDrawReset() {
    Object.assign(state, {
      start: undefined,
      end: undefined,
      isDrawing: false,
    });
  }

  return {
    draw: state,
    onDrawStart,
    onDrawMove,
    onDrawEnd,
    onDrawReset,
  };
}

export default useDraw;
